| error[E0368]: binary assignment operation `+=` cannot be applied to type `&str` | |
| --> $DIR/issue-10401.rs:3:5 | |
| | | |
| LL | a += { "b" }; | |
| | -^^^^^^^^^^^ | |
| | | | |
| | cannot use `+=` on type `&str` | |
| error: aborting due to 1 previous error | |
| For more information about this error, try `rustc --explain E0368`. |